<script>
import CryptoJS from "crypto-js";

export default {
  //随机生成指定数量的16进制key
  $Generatekey: function(num) {
    var library = "zyxwvutsrqponlmkjihgfedcba123456";
    var key = "";
    for (var i = 0; i < num; i++) {
      var randomPoz = Math.floor(Math.random() * library.length);
      key += library.substring(randomPoz, randomPoz + 1);
    }
    return key;
  },
  //加密
  $Encrypt: function(word, keyStr) {
    keyStr = keyStr ? keyStr : "zyxwvutsrqponlmkjihgfedcba123456"; //判断是否存在ksy，不存在就用定义好的key
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var srcs = CryptoJS.enc.Utf8.parse(word);
    var encrypted = CryptoJS.AES.encrypt(srcs, key, {
      mode: CryptoJS.mode.ECB,
      padding: CryptoJS.pad.Pkcs7,
    });
    return encrypted.toString();
  },
  //解密
  $Decrypt: function(word, keyStr) {
    keyStr = keyStr ? keyStr : "zyxwvutsrqponlmkjihgfedcba123456";
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var decrypt = CryptoJS.AES.decrypt(word, key, {
      mode: CryptoJS.mode.ECB,
      padding: CryptoJS.pad.Pkcs7,
    });
    return CryptoJS.enc.Utf8.stringify(decrypt).toString();
  },
  //加密-CBC
  $CBCEncrypt: function(word, keyStr) {
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var viKey = CryptoJS.enc.Utf8.parse(keyStr.substring(0, 16));
    var srcs = CryptoJS.enc.Utf8.parse(word);
    var encrypted = CryptoJS.AES.encrypt(srcs, key, {
      mode: CryptoJS.mode.CBC,
      iv: viKey,
      padding: CryptoJS.pad.ZeroPadding,
    });
    return CryptoJS.enc.Base64.stringify(encrypted.ciphertext);
  },
  //解密
  $CBCDecrypt: function(word, keyStr) {
    keyStr = keyStr ? keyStr : "zyxwvutsrqponlmkjihgfedcba123456";
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var viKey = CryptoJS.enc.Utf8.parse(keyStr);
    var decrypt = CryptoJS.AES.decrypt(word, key, {
      iv: viKey,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.ZeroPadding,
    });
    return CryptoJS.enc.Utf8.stringify(decrypt).toString();
  },
};
</script>
